Trends and future challenges in sampling the deep terrestrial biosphere by Wilkins, Michael J, Daly, Rebecca A, Mouser, Paula J, Trexler, Ryan, Sharma, Shihka, Cole, David R, Wrighton, Kelly C, Biddle, Jennifer F, Denis, Elizabeth H, Fredrickson, Jim K, Kieft, Thomas L, Onstott, Tullis C, Peterson, Lee, Pfiffner, Susan M, Phelps, Tommy J, Schrenk, Matthew O

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